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html editor (with find, replace and preview)

i posted a thread the other day asking how i could find an replace certain text in a text area using javascript, in this thread. now what im trying to do is add a preview to whatever is replaced. using this script.

alone, they work perfectly but but i cant get it to work together... this is what i got so far

There are many errors and warnings in your code. First, validate it here, to see all errors and warnings. Then try to repair them.
But I think you don't have to use iframe for preview. Instead you could use a div. Replace _iframe tag_ with: